Can the clustered dark matter and the smooth dark energy arise from the same scalar field?
May, 20024 pages
Published in:
- Phys.Rev.D 66 (2002) 081301
e-Print:
- hep-th/0205055 [hep-th]
Report number:
- IUCAA-17-2002
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Abstract:
Cosmological observations suggest the existence of two different kinds of energy densities dominating at small ( Mpc) and large ( Mpc) scales. The dark matter component, which dominates at small scales, contributes and has an equation of state while the dark energy component, which dominates at large scales, contributes and has an equation of state . It is usual to postulate wimps for the first component and some form of scalar field or cosmological constant for the second component. We explore the possibility of a scalar field with a Lagrangian L =- V(\phi) \sqrt{1 - \del^i \phi \del_i \phi} acting as {\it both} clustered dark matter and smoother dark energy and having a scale dependent equation of state. This model predicts a relation between the ratio of the energy densities of the two dark components and expansion rate of the universe (with ) in the form . For , we get which is consistent with observations.- 98.80.Cq
- 95.35.+d
- dark matter: cluster
- dark energy
- field theory: scalar
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